几个英语选择题.1.what would it be like to travel at the speed of __

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几个英语选择题.
1.what would it be like to travel at the speed of ____?C
A.a light B lights
C.light D an light
这里的light什么意思?
2.if he had worked harder,he____________________D
A.would succeed B had succeedde
C,should succeed D.would have succeeded
why?
3.this is the first time i ___________here.B
A.was B have been
C.came D.am coming
不应该是C吗
4.he has spent a ___________ day.C
A more worry B most worrying
C more worrying D most worry
5.you _____________ to the meeting this afternoon if you have something to do.D
A,needn't to come
B.don't need come
C,don't need coming
D.needn't come
区别用法什么的

1.光.
以光的速度行进会发生什么?
2.如果他努力过,他就会成功了,状语从句都用完成时了,主句当然也是,都是假设过去已经发生的事情的.
3.this is the first...这样的句子中从句一般都用完成时.
4.他度过了更让人担忧的一天.应该有上下句是表示两者的对比（对比前一天）,而不是最高级
5.needn't 情态动词,后接动词原形

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